Platelet Rich Plasma and Hyaluronic Acid Blend for the Treatment of Osteoarthritis: Rheological and Biological Evaluation. PLoS One. 2016 Jun 16;11(6):e0157048. doi: 10.1371/journal.pone.0157048. eCollection 2016. Russo F1, D’Este M2, Vadalà G1, Cattani C1, Papalia R1, Alini M2, Denaro V1. INTRODUCTION: Osteoarthritis (OA) is the most common musculoskeletal disease. Current treatments for OA are mainly symptomatic and